Miro won't open

I've been waiting for the next version of Miro hoping that i wouldn't still have this problem but i do. Here's my Miro.exe.log :

Traceback (most recent call last):
File "Miro.py", line 71, in <module>
File "Miro.py", line 44, in startup
File "miro\plat\utils.pyc", line 35, in <module>
File "miro\config.pyc", line 31, in <module>
File "miro\appconfig.pyc", line 41, in <module>
File "miro\plat\resources.pyc", line 34, in <module>
File "miro\plat\specialfolders.pyc", line 79, in <module>
File "ntpath.pyc", line 90, in join
TypeError: object of type 'NoneType' has no len()
Exception in thread Thread-1:
Traceback (most recent call last):
File "threading.pyc", line 460, in __bootstrap
File "threading.pyc", line 440, in run
File "miro\plat\pipeipc.pyc", line 186, in _thread
File "miro\plat\pipeipc.pyc", line 198, in handle_message
File "miro\eventloop.pyc", line 45, in <module>
File "miro\trapcall.pyc", line 34, in <module>
File "miro\signals.pyc", line 41, in <module>
File "miro\config.pyc", line 31, in <module>
File "miro\appconfig.pyc", line 41, in <module>
File "miro\plat\resources.pyc", line 34, in <module>
File "miro\plat\specialfolders.pyc", line 79, in <module>
File "ntpath.pyc", line 90, in join
TypeError: object of type 'NoneType' has no len()

Traceback (most recent call last):
File "Miro.py", line 71, in <module>
File "Miro.py", line 44, in startup
File "miro\plat\utils.pyc", line 35, in <module>
File "miro\config.pyc", line 31, in <module>
File "miro\appconfig.pyc", line 41, in <module>
File "miro\plat\resources.pyc", line 34, in <module>
File "miro\plat\specialfolders.pyc", line 79, in <module>
File "ntpath.pyc", line 90, in join
TypeError: object of type 'NoneType' has no len()
Exception in thread Thread-1:
Traceback (most recent call last):
File "threading.pyc", line 460, in __bootstrap
File "threading.pyc", line 440, in run
File "miro\plat\pipeipc.pyc", line 186, in _thread
File "miro\plat\pipeipc.pyc", line 198, in handle_message
File "miro\eventloop.pyc", line 45, in <module>
File "miro\trapcall.pyc", line 34, in <module>
File "miro\signals.pyc", line 41, in <module>
File "miro\config.pyc", line 31, in <module>
File "miro\appconfig.pyc", line 41, in <module>
File "miro\plat\resources.pyc", line 34, in <module>
File "miro\plat\specialfolders.pyc", line 79, in <module>
File "ntpath.pyc", line 90, in join
TypeError: object of type 'NoneType' has no len()

Traceback (most recent call last):
File "Miro.py", line 71, in <module>
File "Miro.py", line 44, in startup
File "miro\plat\utils.pyc", line 35, in <module>
File "miro\config.pyc", line 31, in <module>
File "miro\appconfig.pyc", line 41, in <module>
File "miro\plat\resources.pyc", line 34, in <module>
File "miro\plat\specialfolders.pyc", line 79, in <module>
File "ntpath.pyc", line 90, in join
TypeError: object of type 'NoneType' has no len()
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